Concrete reinforcement.



R. S. ALLYN.

CONCRETE REINFORCEMENT. APPLICATION FILED JULY 11,1908.

Patented June 28, 1910.

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ROBERT S. ALLYN, OF NEW YORK, N. Y.

CONCRETE REINFORCEMENT.

Specification of Letters Patent.

Application filed July 11, 1908.

To all whom it may concern:

Be it known that I, ROBERT STARR ALLYN, a citizen of the United States, residing at New York, in the county of Kings and State of New York, have invented certain new and useful Improvements in Concrete Reinforcements, of which the following is a specification.

The invention relates particularly to a structure for reinforcing concrete beams, girders, lintels, sills, joists, columns, posts and piles. The general term beam will be used to cover the entire class.

My main object is to provide a reinforcing structure which can be manufactured cheaply, and readily set up and which will take care of the tensional and shearing stresses in the beams so as to prevent checking and distribute the stresses properly throughout.

Rods and bars of various types are in common use as a reinforcement for concrete beams and in the more carefully designed and constructed work the rods are spaced by one means or another so that they will be in their proper positions and cannot be displaced when filling the concrete into the forms. In floors, walls, ceilings, roofs, and other slab-like structures expanded metal is used and has especial advantages by reason of the uniform distribution of metal throughout the mass of concrete. I take advantage of the properties of rods and expanded metal as hereinafter set forth.

Figure l is a side View of a structure embodying my invention. Fig. 2 is a plan view of the same part being omitted. Fig. 3 is a transverse sectional view on the plane of the line XX Fig. 1. Fig. 4c is an end view of the same. Fig. 5 is a fragmentary side view of a simpler form. Figs. 6, 7, and 8 are end views of diiferent types.

Many different designs and arrangements will of course be utilized for different conditions. The illustrations of Figs. 1 to 4: inclusive show a reinforcement for a large girder in which the two rods or bars 1 and 2 are straight and parallel throughout while the two rods 3 and 4 are depressed at the center so as to be parallel and in the plane with rods 1 and 2 and are raised at the ends. The ends of all four rods however are parallel. The web 5 of metal has been stretched or expanded longitudinally of the rods and consists of the inclined members or diagonals such as 6, 7 and 8, 9 which are connected by strands such as 10 and 11. These diagonals terminate in lugs such as 12, 13, 1 1, 15, 16, 17, 18 and 19 at the upper and lower edges of the web.

The upper alternate lugs at the ends of the web are bent laterally and connected to the upper ends of the bent rods 3 and 4: as at 12 and 13, and 16 and 17. The lower alternate lugs at the ends of the web are bent laterally and connected to the ends of the straight rods 1 and 2 as at let and 15, and 18 and 19. The lower alternate lugs at the central portion of the beam are bent laterally and connected to the depressed portions of the opposite bent rods 3 and at as at 20 and 21. This ties the two pairs of rods together and yet holds them properly spaced from each other. If additional security is required the rods may be tied by bands such as 22 at the center of the straight rods 1 and 2 where the web is not connected.

The lateral bending of the lugs 12, 13, 20, 21 may be inclined as in Figs. 4 and 6 or straight as at 23 and 24 in Figs. 7 and 8. In each case they act as anchors to hold the web securely in place in the concrete. I also prefer to bend the alternate lugs at the upper central edge of the web laterally in opposite directions as at 25 and 26 to anchor the central diagonals of the web.

In some cases it will be suflicient to provide tension rods in the bottom of the beam and in some cases a pair of straight tension rods in the bottom will be supplemented by light straight rods in the top as indicated in Figs. 5, 6 and 7. Sometimes the design will require the upper rods to be nearer together than the lower rods as in Fig. 6. In some cases a single rod at the top will be suflicient as at 27 in Fig. 8.

The rods may be of any suitable type either plain or deformed, round as shown in Figs. 1 to 7 or square as at 27, 28 and 29 in Fig. 8. The lugs are shown as wrapped around the rods. This is a simple method and in some cases sufficiently secure. I prefer to weld the lugs to the rods in some cases so that there can be no possibility of the lugs slipping along the rods.

Preferably the expanded metal is flat?- that isthe bonds and strands all lie in the same plane so that direct tensional resistance will be available at the bonds. The diagonals such as 6, 7, 8, and 9 serve to take care of the shearing stresses and to prevent checking and cracking of the concrete. The

expanded metal is preferably formed by slitting a sheet transversely and then stretching it longitudinally. The slittingforms finger-like members along the edges which are separated by the longitudinal ex pansion of the sheet and project laterally so as to form attaching means along the edges of the sheet. Some of these fingers, are then bent in one direction and some in another and some are attached to longitudinal tension rods. The bending of the lingers or lugs out of the plane of the main body of the sheet serves to anchor the sheet more securely in the concrete when in use.

What I claim is: Y I

1. A reinforcing element for concrete structures comprising a pair of spaced rods and a web of longitudinally expanded metal having lugs along its opposite edges, the alternate lugs at one edge beingbent in 0pposite directions attached to the two rods respectively.

2. A reinforcing element comprising a pair of rods spaced apart from each other and a central web of longitudinally expanded metal having inclined diagonals terminating in lugs at its opposite edges, some of the lugs at one edge beingbent laterally and attached to one rod and some of the lugs at the same edge being bent laterally in the opposite direction and attached to the other rod.

3. A reinforcing element for concrete structures comprising a pair of spaced rods and a' Web of expanded metal having lugs along its opposite edges, the alternate lugs at one edge being bent laterally and attached to the two rods respectively, the lugs at the other edge being bent over laterally to form anchors.

4. A reinforcing element for concrete structures comprising a web of longitudinally expanded metal consisting of strands connected so as to form diamond shaped openings and having lugs along its opposite edges, some of the lugs at each edge being bent laterally in one direction and other lugs at each edge being bent laterally in,the opposite direction, forming anchors.

5. A reinforcing element comprising four spaced rods parallel throughout portions of their lengths and a web of longitudinally 1 expanded metal having lugs along the edges attached to said rods throughout a portion of their length. a

6. A reinforcing element comprising two pairs of spaced rods and a web of longitudinally expanded metal having lugs along its opposite edges some of said lugs being bent in one direction and others in another, some of the lugs at each edge being attached to one of the rods. 7 7. Areinforcing element for concrete structures comprising two pairs of spaced rods and a connecting web of expanded metal having projecting lugs along its opposite edges, alternate lugs along each edge being bent in opposite directions and attached to the rods of the pair adjacent thereto.

8. A reinforcing element comprising a pair of rods spaced apart from each other and a central Web of fiat expanded metal having inclined diagonals terminating in lugs at its opposite edges, some of the lugs at one edge being wrapped around one rod lower rods, a pair of bent rods having their.

central portions depressed adjacent said straight rods and their ends in a plane above and a web of expanded metal having lugs along the upper and lower edges, some of said lugs being attached to said rods and some of said lugs being free and bent later ally to form anchors.

11. A reinforcing element for a concrete beam comprising, a plurality of rods parts of all of said rods lying in the same plane, I

and a web of expanded metal having lugs along the bottom edge, some of said lugs be ing attached to each of said rods.

'12. A reinforcing element fora concrete beam comprising four rods parallel through= out a part of their length and a web of expanded metal having lugs along one edge, some of said lugs being attached to each of said rods. j 13. A reinforcing element for concrete structures comprising a pair of parallel rods having their ends elevated above their central portions and an expanded metal fabric having lugs along its upper and lower edges, some of the lugs at the upper edge being se cured to the relatively raised ends of said rods and some of the lugs at the lower edge being secured to the relatively depressed central portions of said rods.

14. A reinforcing element for concrete structures comprising a-pair of parallel rods spaced apart and having theirends elevated above their central portions and an expanded metal fabric having lugs along its upper andlower edges, some of the lugs at the ends of the upper edge being secured to the relatively raised ends of said rods and some of the'lu'gs at the center of the lower edge being secured to the relatively depressed central portions of said rods and others of the lugs V at the center of the upper edge being bent over to form anchors.

15. A concrete reinforcing element comprising a fiat Web of expanded metal having the strands and bonds all flat and lying in the same plane, the strands terminating in projecting lugs along the opposite side edges and parallel longitudinal rods welded to said lugs along the edges of said web.

16. A concrete reinforcing element comprising a web of metal slitted transversely and expanded longitudinally and of greater length than Width andhaving diagonals terminating in projections along the opposite side edges and a tension rod secured to the projections along each edge of the web, the rods being parallel and preventing lateral contraction of the Web.

17. A reinforcement for concrete beams comprising two parallel rods, a sheet of longitudinally expanded metal having laterally projecting lugs at its edges bent out of the plane of the central portion and secured to said rods.

18. A reinforcing element for concrete comprising a pair of parallel rods and an expanded metal strip having diagonal members terminating in lugs along the edges bent in opposite directions forming an arch, some of the lugs being attached to one rod and others attached to the other rod.

19. A reinforcing element for concrete structures comprising a web of expanded metal having strands connected so as to form diagonal members and terminating in lugs along the opposite edges forming attaching means, some of the lugs along one or both edges being bent laterally in one direction and others being bent laterally in the opposite direction.

20. A reinforcing element for concrete comprising a flat integral Web of expanded metal consisting of strands arranged in connected diagonals with diamond shaped openings between them and terminating in lugs along the opposite edges forming attaching means, some of said lugs being bent in one direction and others in the opposite direction.

21. A reinforcing element for concrete comprising a plurality of parallel rods spaced apart from each other and a web of expended metal having its strands connected so as to form diagonal members with diamond shaped openings between them and terminating in lugs along one edge, some of said lugs being attached to each rod.

ROBERT S. ALLYN.

Witnesses:

E. BRADFORD, GILBERT B. FERRIS. 

